Diamides of alkane dicarboxylic acids



Patented Aug. 17, 1948 Henry Martin and Hans e1, I Z a lin,"Riehen, near Base], and 'Alfredf'Mal gq oxntic Basel, Switzerland, assignors tdalbR. Geig'y A. G., Basel, Switzerland, afS wissffii'mf 4 Original application .Qctobec, 15,4. 1 1943, Serial No. 506,418. Divided'and this ap;-'

N Drawing.

plication March 6, 1945, Serial No 81 ,3 1 5.

Switzerland December 18,1942 i 4 Cla ms. (0!..26Q-561) This is a, divisional patent application of our copending patent application Ser. No. 506,418, filed on October 15, 1943.

taining at least 3 G-atoins. I The missing substituents also subsequently be introduced into amides which have been prepared by means of low substituted bases'instead of with secondary 5 amines (of. Titherley J. Chem. Soc. London, 79,

" The new compounds may be used as valuable It has been found that substituted alkane dicarboxylic acid amides deriving from alkane dicarboxylic acids, selected from the group consisting of ethane and propane dicarboxylic acids tetramethyl succinic acid, d-methyl-B-ethyl succinic acid, fins-dimethyl glutaric acid, cut-di-v methyl glutaric acid, d:d:d'-trimethyl glutaric, acid, drdtp-trimethyl glutaric acid.

The new alkane dicarboxylic acid diamides ditherapeutics, especially, as analeptics; partly they are also suitable as solving assistants.

10 The present invention is illustrated, but not 7 limited by the following examples, wherein the partsare by weight, unless otherwise stated.

Exmrtmzl j l 365 parts of, asymmetrical dimethyl succinic acid chloride, made from azd-dimethylsuccinic acid and phosphorus-pentachloride, B. 'P. 13 mm. 80-85 C. are allowed to drop, while. coolinainto substituted in the amide radical are obtained by a ethereal solution f 5 pa ts 'di th lamin causing alkane dicarboxylic acids of the above definition or functional derivatives thereof, such as for example their halides, esters-or anhydrides, to react with secondary aliphatic or cycloaliphatic amines containing at least 3 C-atoms or their salts, in the presence orabsence of solvents, of condensation agents as well as of acid binding agents.

As condensation agents there are advantageous ly used phosphorus halides, phospho ruspent oxide, thionyl chloride, phosgene and so on.

' Another method consist's in th'at 'the salts of the above defined dicarb'oxylic acids are caused to react with carbamic acid halides derived from secondary aliphatic or cycloaliphatic amines con- (excess of 10%). The diethylamine'hydrochloridethus precipitated-and the solvent are removed, while the residue is dissolved-inv water and precipitated by means oftcaustic potash lye.

After a possibly repeated distillation in highvacu'o the ajz-a-dimethyl succinic acid ,bis-diethyl amide distils at a pressure of 0.35 mm. at 122 123" C. The new compound is easily soluble in water and organic solvents. I

By interaction ofdiethvl carbamic acid cmariae with the sodium salt of the ma-dimethyl succinic';

--acid. the.'. above described diethyl amide is also obtain'ec l in d'goodmem; 1 Y

-'- Further compounds 'o f'this group are-shown in 'thefouo m table Succinic acids R I IV v QQQ ELI j-r 1,; Y 1: solubility in: R Q amine B. P. (mm.) form w=watet e=ether (HIE-[5 I 1 HN(C;Ht)z %151? C.(0 .5) liquid--. wsolublacsoluble.

. 2 15 Hr I z I GHs CH:C H\: a I 2 o- H on, -162 C.(0.2) --do w difiicultly soluble,

, l Y esoluble. CH: Hr- CHr-C 2 v ampleslead to the c 40 parts or giiethylamine aredissolwed in- 200 parts by-volume of absolute ether and dropwise treated at -10 C. with a solution of 22 parts of pzfi-dimethyl glutaric acid chloride in 150 partsby volume of absolute ether. iThen themixture is stirred at room temperature for still 2 hours, whereupon the diethylamine hydrochloride is sucked ofi, the ether solution washed with aconcentrated potassium carbonate solution, then dried with calcined sodium sulfate. .Thesolvent is now distilled off and the residual oil distilled in high-vacuo; its boiling pointat 0,2 mm. pressure is 126-128 C.

The Bzfl-dimethyl glut amide is soluble in water.

Further compounds of this group are enumerated in the following table:

aric acid bis-diethyl- Tab 2 Glutaric acid s R dialkylamine containing at least 3 carbon atoms, and R1 and R2 each represents a member selected from the group consisting of hydrogen and lower alkyl.

2. The lois-diethylamide of '2:2-dimethy1 glutaric acid of the formula being a colorless liquid of the boiling point of 126-128 C. at 0.2 mm. pressure.

COOH

solubility in: -No. R :amine B. P.-(mm.) form w=water I e=ether cm m- Zorn-cm 1 EN on, 187-l900. (0.3)..." liquid w=diflicultly soluble,

e.=soluble. I H: ,c r GET-CH1 Q z\ r' 2;"- T HN(GH1.CH=OH,)Q 1so 1e20.(0.5) do w=ditficultlysoluble,

'/(\J e=soluble. CH3 Hg C:HI'\(l3Hr-' I 3--.- 'HN(C:H:): 140-1430-'(1) do w=.difiicultly soluble. v CgtlikJHr- QH:\(I3HF1 a 4- -d0 -135 1 36 0.. (0.6)-.- 501m M. P. 51 0.- w=moderatelysoluble,

. p e=easily soluble.

CHI

CHr-CH- According to the invention the'operation sequences of the reaction illustrated inilthe exorresponding amides-when using the following dicarboxylic acids: flldmmeth yl ethyl succinic acid, tetramethyl succinic acid, a-methyl-fl-ethyl succinic acid, aza-dimethyl glutaric acid and azazd-trimethyl glutaric acid.

What we claim is:

1. A member selected from the group consisting of the alkane dicarboxylic acid diamides of the formulae.

O0 O .X 6-0 0 .X

R: R1 and Lower alkyl Lower alkyl -C O .X Lower alky Lower aIkYI (EHLCO.X

wherein X- represents the radical of a secondary 3. The bis-diethylamide of 1:1-dimethy1 succinic acid of the formula being a colorless liquid of the boiling point of 122-.123 C. at 0.35 mm. pressure.

7 4. The bis-diethylamide of 1:1-diethyl succinic acid of the formula being a colorless liquid of the boiling point of 150-151 C. at 0.5 mm. pressure.

HENRY MARTIN. HANS GYSIN. HANS ZAESLIN. ALFRED MARGOT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,986,854 Reid Jan. 8, 1935 2,094,608 Kritchevsky Oct. 5, 1937 2,130,948 Carothers Sept. 20, 1938 2,310,873 Sauer Feb. 9, 1943 6 OTHER REFERENCES Paden et al., Journal American Chemical Society, 58, 2487-2499 (1936).

Blaise et al., Comptes Rendus Acad. Sci, vol. 180 (1925) page 1345.

Huan, Comptes Rendus Acad. Sci., vol. 188 (1929) page 1174. 

